Accurate measuring-gage.



v me M H l- C. E. JOHANSSON.

ACCURATE MEASURING GAGE.

APPLlcAnoN FILED ocr. '21. 1914.

Patented Feb. 27, 1917.

sas

CARL EDVARD JOI-IANSSON, OF ESKILSTUNA, SWEDEN.-

ACCURATE lVIEASURINGr-GAGE.

Applicationfled October 21,1914.. SerialNa 867,780.

This invention relates to accurate Ineasuring gages of the kind used toa large eX- tent within the mechanical engineering industry. When usinggages of this kind, it is of importance to prevent the hea-t of the handfrom being transmittedto 'the metal gage, since, otherwise, the gagewill expand, so that the accurate'measure is lost and the measuringresults 'become' uncertain. In order to prevent said inconvenience,rit`has been proposed to provide the gages, at the point where, in usingthem, they are seized by the hand, with plates or the like made of heatinsulating material, as for instance wood, ebonite or the like, so thatthe hand will be prevented from touching the material. Even such anarrangement has not, however, proved to be sulicient, because the heatof hand, when the gage is used 'for a long time, will be transmitted tothe metal.

The object of this invention is to provide a gage of the kind mentionedwith insulating platos so arranged that an insulation as complete aspossible is attained. lxfith this object in view the invention consists,

chiefly, in this that the plates, at the sidey facing the gage, or thegage at the sides facing the insulating plates, are providedwithrecesses forming air spaces. On account ot' this, narrow edges only ofthe insulating plates bear against the metal, so that trans mission ol'heat :from the hand to the metal is prevented as far as possible. Incase the plates in well-known manner are secured to the gage by a screw,a rivet or the like, said screw or rivet should, preferably, besurrounded by a ring or a socket made of heat insulating materialpreventing the heat from being transmitted in that way to the metal.

I attain this object and advantageby means of the construction. shown inthe accompanying drawing in which Figure 1 is a: side view of a gagemade in accordance with the invention and Fig. 2 shows the gage insection on the line AMB in Fig. l, looking in the direction of thearrows. Fig. 3 shows a similar section of another embodiment.

In the drawing a, a denote two plates or disks made ot heat insulatingmaterial, as for instance wood, fiber, ebonite or the like, said platesor disks being placed-,at each side of the traine Z) of the gage andsecured to the frame by a screw c passing through the same, and a nut d.Said platesor disks are, at the side :tacingthe frame provided withrecesses e, so that the insulating plates or disks hear against themetal with narrow edges only. Consequently, the recesses form insulatingair spaces. For the screw c` may be substituted a rivet or the like. l

In order to prevent the heat of the hand from being transmitted to theframe b through the screw or rivet c, said screw or rivet is surroundedby an insulating ring which, preferably, is made of the same .materialas the plates or disks a. In this manner even the smallest gages may beprovided with handles insulating the heat of the hand. Inst ad otproviding the recesses in the plates, the recesses may be provided inthe gage or in both the gage and the plates. Fig. 3 shows a gage theframe g o't which. is provided with recesses /L correspondingwithrecesses in the insulating plates 7c. This construction is otherwisesimilar to that shown in Figs. l and 2.

Having thus described the invention, what I claim is:

l.. The conibination with a gage, of heat insulating means securedl ateach side thereof and having recesses which, at the side ot' saidinsulating meansfacing the gageform air spaces and narrow edges bearingagainst the gage, means forl securing said insulating means to 'thegage, and heat insulating means surrounding said securing means,substantially as and for the purpose set forth.

2. The combination with a gage, of heat insulating plates secured to thegage at each side thereof and having recesses which, at In testimonywhereof I have hereunto Set 'the side of said plates facing the gage,form my hand 1n presence of two subsolhlng witan' spaces and narrowedges bearlng agonist nesses.

the gage, a bm' securing' said plates to the CARL EDVARD JOHANSSN. gage,and a heat insulating annulzu1V mem- TWitnesses:

ber surrounding said bal', substantially as FRED. NORDSJ,

and OI the PUTPOSQ Set Oltll. TLIURE STERLING.

Copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents, Washington, D. C.

